Display screen or portion thereof with a graphical user interface



FIG. 1 is a front view of the display screen or portion thereof with a graphical user interface; and,

FIG. 2 is another front view of the display screen or portion thereof with a graphical user interface showing alternate broken lines.

The outermost broken lines illustrate the display screen or portion thereof. The remaining broken lines showing text, icons, tables, cluster diagrams, and dotted cluster data points illustrate portions of the graphical user interface. None of the broken lines form part of the claimed design. 

CLAIM The ornamental design for a display screen or portion thereof with a graphical user interface for analytics, as shown and described. 